Books, say, about new times (7)
I believe the answer is:
engages
'books' is the definition.
(book can mean to book or engage someone's services)
'say about new times' is the wordplay.
'say' becomes 'eg'.
'about' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'times' becomes 'ages' (age is a kind of time).
'eg' going around 'n' is 'eng'.
'eng'+'ages'='ENGAGES'
(Other definitions for engages that I've seen before include "Employs, hires" , "books" .)